TASK 24-41-00-810-808

 Loss of the CFDIU Discrete Signal to the GPCU
 1. Possible Causes
_______________
 - GPCU (1XG)

 - CFDIU (1TW)

 - wiring

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 24-41-00-740-002 Operational Test of the Ground power Control Unit
 (GPCU) AMM 24-41-34-000-001 Removal of the Ground Power Control Unit (GPCU) (1XG) AMM 24-41-34-400-001 Installation of the Ground Power Control Unit (GPCU)
 (1XG)
 AMM 31-32-34-000-001 Removal of the CFDIU (1TW)
 AMM 31-32-34-400-001 Installation of the CFDIU (1TW)
 ASM 31-32/06

 3. Fault Confirmation
__________________
 A. Test
 (1) Do the operational test of the ground power control unit (Ref. AMM TASK 24-41-00-740-002).
 4. Fault Isolation
_______________
 A. If the test gives the maintenance message CHECK GPCU PIN A4B CFDIU 1TW PIN A9K WIRING:
 - replace the GPCU (1XG) (Ref. AMM TASK 24-41-34-000-001) and (Ref. AMM TASK 24-41-34-400-001).
 (1) If the fault continues:

 - replace the CFDIU (1TW) (Ref. AMM TASK 31-32-34-000-001) and (Ref. AMM TASK 31-32-34-400-001).

 (2) If the fault continues:

 - do a check and repair the wiring from the pin AA/4B of the GPCU (1XG) to the pin AA/9K of the CFDIU (1TW) (Ref. ASM 31-32/06).
 B. Do the test given in Para. 3.
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 001-049, 051-099, 101-149, 151-199, ∞∞24-41-00∞∞∞∞∞∞∞∞∞∞Page 211
 201-299, 301-399, Aug 01/05 CES

R **ON A/C ALL

 TASK 24-41-00-810-809
 Aircraft Electrical Circuits cannot be supplied from the External Power
 1. Possible Causes
_______________
 - RCPT-EXT PWR (20XG)

 - EPC (3XG)

 - GLC-APU (3XS)

 - RELAY-EPC AUX CTL (5XG)

 - GLC-1 (9XU1)

 - GLC-2 (9XU2)

 - wiring

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 24-22-55-000-001 Removal of the Contactors (9XU1, 9XU2, 11XU1, 11XU2) AMM 24-22-55-400-002 Installation of the Contactors (9XU1, 9XU2, 11XU1,
 11XU2) AMM 24-23-55-000-001 Removal of the APU GLC (3XS) AMM 24-23-55-400-001 Installation of the APU GLC (3XS) AMM 24-41-00-861-002 Energize the Aircraft Electrical Circuits from the
 External Power AMM 24-41-51-000-001 Removal of the External Power Receptacle (20XG) AMM 24-41-51-400-001 Installation of the External Power Receptacle (20XG) AMM 24-41-55-000-001 Removal of the External Power Contactor (EPC) AMM 24-41-55-400-001 Installation of the External Power Contactor (EPC) ASM 24-41/01
 3. Fault Confirmation
__________________
 A. Energize the Aircraft Electrical Circuits from the External Power (Ref. AMM TASK 24-41-00-861-002).
 NOTE : Examine the external power supply-cable and the external power
____ receptacle before you do the connection. If you find corrosion or damage, or if the pins are not aligned correctly, replace the RCPT-EXT PWR (20XG) (Ref. AMM TASK 24-41-51-000-001) and (Ref. AMM TASK 24-41-51-400-001).

 4. Fault Isolation
_______________

 A. If the above procedure confirms the results below when the EXT PWR pushbutton switch is pushed: . the AVAIL legend of the EXT PWR pushbutton switch stays on, . the ON legend of the EXT PWR pushbutton switch does not come on, . the FAULT legend of the GEN1 and the GEN2 pushbutton switches stays off.
 - Do a check for 28VDC between pins B/3 and B/5 of the EPC (3XG) (Ref. ASM 24-41/01).
 (1) If there is 28VDC:

 - Replace the EPC (3XG) (Ref. AMM TASK 24-41-55-000-001) and (Ref. AMM TASK 24-41-55-400-001).

 (2) If there is no 28VDC:

 - Do a check for 28VDC at pins A/D1 then A/X1 of the EPC auxiliary control relay (5XG).
 (a) If there is 28VDC:
 - Do a check for 28VDC at pin B/24 of the APU GLC (3XS) (Ref. ASM 24-41/01).
 1 If there is 28VDC:
_
 - Replace the GLC-APU (3XS) (Ref. AMM TASK 24-23-55-000-001) and (Ref. AMM TASK 24-23-55-400-001).
 2 If there is no 28VDC:
　
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